Year	Percent
1998	34.7165
1999	33.45153
2000	33.96201
2001	32.02379
2002	31.35122
2003	31.07815
2004	23.87014
2005	23.28688
2006	23.32975
2007	23.64241
2008	24.17084
2009	27.59751
2010	24.65824
2011	28.09955
2012	20.75625
2013	24.71208
2014	22.81701